Este trabajo tiene el propósito de describir las recomendaciones más recientes para el cálculo de las distribuciones de dosis alrededor de fuentes de braquiterapia de alta tasa. En nuestro país existe un único modelo de fuente para braquiterapia HDR; éste es tomado como ejemplo. En este trabajo se trata de priorizar el punto de vista práctico

The ocular brachytherapy, sorne times the only altemative to conserve the visual organ in patients of ocular cancer, comes making in the Instituto Nacional de Enfermedades Neoplasicas using threads of Ir 192; which, are placed in radial form on the inner surface of a spherical gold cap of 18 K; the cap remains in the eye until reaching the dose prescribed by the doctor. The primary target of this work is to be able to calculate of a correct and practica!way the time that must last the treatment of ocular brachytherapy to reach the dose prescribed by the doctor. In order to reach this objective, it is use the integral of Sievert corrected by attenuation effects and dispersion (polynomials of Meisberg); calculating it by the method of Simpson. In the calculations using integral of Sievert the dispersion produced by the gold cap and the variation of the constant of dose rate with the distan...